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diff --git a/Dummy_Clock.cpp b/Dummy_Clock.cpp
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+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Matthias P. Braendli
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "SoapyDummy.hpp"
+#include <SoapySDR/Logger.hpp>
+#include <SoapySDR/Formats.hpp>
+#include <chrono>
+
+std::vector<std::string> SoapyDummy::listTimeSources(void) const
+{
+    return {"internal"};
+}
+
+void SoapyDummy::setTimeSource(const std::string &source)
+{
+}
+
+std::string SoapyDummy::getTimeSource(void) const
+{
+    return "internal";
+}
+
+bool SoapyDummy::hasHardwareTime(const std::string &what) const
+{
+    return true;
+}
+
+long long SoapyDummy::getHardwareTime(const std::string &what) const
+{
+    using namespace std::chrono;
+    const auto now = steady_clock::now();
+    return duration_cast<nanoseconds>(now.time_since_epoch()).count() - m_time_epoch;
+}
+
+void SoapyDummy::setHardwareTime(const long long timeNs, const std::string &what)
+{
+    // From getHardwareTime() we have:
+    //   timeNs = now - epoch
+    // we derive
+    //   epoch = now - timeNs
+    using namespace std::chrono;
+    const auto now = steady_clock::now();
+    m_time_epoch =
+        duration_cast<nanoseconds>(now.time_since_epoch()).count() - timeNs;
+}